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homogeneous.h
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2 // Copyright 2016 Pixar
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24 #ifndef GF_HOMOGENEOUS_H
25 #define GF_HOMOGENEOUS_H
26 
27 /// \file gf/homogeneous.h
28 /// \ingroup group_gf_LinearAlgebra
29 /// Utility functions for GfVec4f and GfVec4d as homogeneous vectors
30 
31 #include "pxr/pxr.h"
32 #include "pxr/base/gf/vec3d.h"
33 #include "pxr/base/gf/vec3f.h"
34 #include "pxr/base/gf/vec4d.h"
35 #include "pxr/base/gf/vec4f.h"
36 #include "pxr/base/gf/api.h"
37 
39 
40 /// Returns a vector which is \p v homogenized. If the fourth element of \p v
41 /// is 0, it is set to 1.
42 /// \ingroup group_gf_LinearAlgebra
43 GF_API
45 
46 /// Homogenizes \p a and \p b and then performs the cross product on the first
47 /// three elements of each. Returns the cross product as a homogenized
48 /// vector.
49 /// \ingroup group_gf_LinearAlgebra
50 GF_API
52 
53 GF_API
55 
56 /// Homogenizes \p a and \p b and then performs the cross product on the first
57 /// three elements of each. Returns the cross product as a homogenized
58 /// vector.
59 /// \ingroup group_gf_LinearAlgebra
60 GF_API
62 
63 /// Projects homogeneous \p v into Euclidean space and returns the result as a
64 /// Vec3f.
65 inline GfVec3f GfProject(const GfVec4f &v) {
66  float inv = (v[3] != 0.0f) ? 1.0f/v[3] : 1.0f;
67  return GfVec3f(inv * v[0], inv * v[1], inv * v[2]);
68 }
69 
70 /// Projects homogeneous \p v into Euclidean space and returns the result as a
71 /// Vec3d.
72 inline GfVec3d GfProject(const GfVec4d &v) {
73  double inv = (v[3] != 0.0) ? 1.0/v[3] : 1.0;
74  return GfVec3d(inv * v[0], inv * v[1], inv * v[2]);
75 }
76 
78 
79 #endif /* GF_HOMOGENEOUS_H */
GfVec3f GfProject(const GfVec4f &v)
Definition: homogeneous.h:65
PXR_NAMESPACE_OPEN_SCOPE GF_API GfVec4f GfGetHomogenized(const GfVec4f &v)
GLboolean GLboolean GLboolean GLboolean a
Definition: glew.h:9477
Definition: vec3f.h:63
Definition: vec4d.h:63
const GLdouble * v
Definition: glew.h:1391
GLclampf f
Definition: glew.h:3499
GF_API GfVec4f GfHomogeneousCross(const GfVec4f &a, const GfVec4f &b)
Definition: vec4f.h:63
GLdouble GLdouble GLdouble b
Definition: glew.h:9122
PXR_NAMESPACE_CLOSE_SCOPE PXR_NAMESPACE_OPEN_SCOPE
Definition: path.h:1245
Definition: vec3d.h:63
#define PXR_NAMESPACE_CLOSE_SCOPE
Definition: pxr.h:83
#define GF_API
Definition: api.h:40